I'm in a debate over spark plugs... In one motor I have an HEI and the other (spare 360) I have an MSD Ignition system... In the link below there are various plugs, are any of you guys running any of these plugs with either an HEI or MSD Ignition system? If so, what has your experience been like with them...
http://www.gsparkplug.com/products/s.../champion/n12y